InterviewSolution
`sqrt(2)tan^(-1)((1)/(2)(tan((x)/(2))-1))+c``sqrt(2)tan^(-1)((1)/(sqrt(2))(tan((x)/(2))-1))+c``2TAN^(-1)((1)/(2)(tan((x)/(2))-1))+c``2tan^(-1)((1)/(sqrt(2))(tan((x)/(2))-1))+c`
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